Meanwhile, subjects in the MDD group tended to have elevated AIP, BMI, WC, WBC, Neu, Lym, PLT, ALP, GGT, TG, FPG, HbA1c, serum phosphorus, and lower Hb, AST, UA, HDL-C, serum iron, and sodium levels (P<0.05). Here, AIP is linked to major depressive disorder.